Typo fix for find command.

Change-Id: I6250eeb0085382303ebeaa43cce36244c08e4d21
diff --git a/test-salt-formulas-env.groovy b/test-salt-formulas-env.groovy
index 1759707..486bd3a 100644
--- a/test-salt-formulas-env.groovy
+++ b/test-salt-formulas-env.groovy
@@ -112,7 +112,7 @@
       } catch (Throwable e) {
         // If there was an error or exception thrown, the build failed
         currentBuild.result = "FAILURE"
-        sh(script: 'find .kitchen/logs/ iname "*.log" | xargs -I{} bash -c "echo {}; cat {}"')
+        sh(script: 'find .kitchen/logs/ -type f -iname "*.log" | xargs -I{} bash -c "echo {}; cat {}"')
         ruby.runKitchenCommand("destroy", cleanEnv)
         throw e
       } finally {